Create graphics class TuXing, punctuated with attributes and methods, and properties: long, wide, the method of pupil method: to calculate the area of

Have brought no-parameter constructor and constructor with no parameters, create rectangle ChangFangXing derived class, create a square ZhengFangXing derived class, two classes are inherited from the graphics, writing test cases

Create a rectangle object new ChangFangXing (3, 4), its width is 3 and 4, direct assignment also create a square object, its length is 5, direct assignment respectively calculate the area of the rectangle object of pupil square object

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Very urgent, please answer

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Public abstract class TuXing {

Private int length; 
Private int width; 

Public TuXing (int length, int width) {
This. Length=length; 
this.width=width; 
} 

Public abstract void girth (); 

Public abstract void area (); 
} 

/* * 
* rectangle class 
*/
The class ChangFangXing extends TuXing {

Public ChangFangXing (int length, int width) {
Super (length, width); 
} 

/* * 

 * calculate circumference*/
@ Override 
Public void girth () {

} 

/* * 

 * calculation area*/
@ Override 
Public void area () {

} 
} 

/* * 

 * square*/
The class ZhengFangXing extends TuXing {

Public ZhengFangXing (int length, int width) {
Super (length, width); 
} 

/* * 

 * calculate circumference*/
@ Override 
Public void girth () {

} 

/* * 

 * calculation area*/
@ Override 
Public void area () {

} 
} 

Calculate the pupil write it by yourself